Keira Knightley is a British actress known for her work in period pieces. Katie McGrath is an Irish actress best recognized as the enchantress Morgana in the BBC series 'Merlin.' Both have a propensity for keeping their mouths open, which is why we think they're a match made in doppelganger heaven.

Knightley - seen above starring in the film 'Anna Karenina' about the Tolstoy novel of the same name - has long been a fan of donning corsets for films like 'Pirates of the Caribbean,' 'Pride and Prejudice' and 'Atonement.' At least when she's not creating memes with 'The Walking Dead' star Andrew Lincoln.

While Knightley is a fan of historically accurate films (minus 'Pirates' because you know that's not even close), her counterpart McGrath seems to be drawn to historically muddled television series. Since the end of the ahistorical 'Merlin,' in which magic is real and forks exist, she has signed onto a period piece for NBC set in the 1890s starring Dracula, so it's been given the out-of-the-box title of 'Dracula.' Because network executives are super creative these days.

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